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Last month we took a look at static pressure and variable speed motors. This month we'll continue the discussion on variable speed. The more HVAC performance test reports I review the more convinced I am that variable speed motors are becoming a necessity, not an...
by David Holt
Are Maintenance Agreements Really Magic? by David Holt, NCI Director Sales & Service Leadership In the past 37 years working in the HVAC business, I've witnessed many owners grasping for straws, searching for the "magic wand" that will solve all of their problems....
Airside vs. Refrigerant Performance Measurement When it comes to performance measurement and air conditioning systems, most master technicians gravitate to one of two measurement techniques. They either choose to measure the airside or the refrigerant side....
When it comes to performance measurement of air conditioning systems, most master technicians gravitate to one of two measurement approaches: the airside or the refrigerant side. On one hand, refrigeration experts will challenge anyone who questions pressure and...
by National Comfort Institute, Inc.
Nearly all grille manufacturers publish a ‘free area' for each grille or register. The question is, are these free area factors meant to be used as a correction or Ak factor? Are these numbers meant to correct for the change in air velocity as it passes through a...
by National Comfort Institute, Inc.
COMFORT TEAM Arizona Air Conditioning & Heating Specialist In 1996 Bryce Johnson hosted NCI's first private training event. We conducted the training in his living room at his home in Scottsdale, Arizona. At the time he had about 8 trucks, and did maybe 1.5...
by Jim Davis
When selling heating equipment, odds are most of us are discussing rated efficiency and how much fuel our customers may save with higher rated equipment. Much of this savings will be based on the listed AFUE (Annual Fuel Utilization Efficiency) rating of the...
As the temperature rises outside, some companies feel the necessity to place airflow and combustion diagnostics on the back burner. The result is missed opportunities outside of the box. Most system defects aren't revealed by the typical clean-and-check service call....
The primary goal of air diagnostics is to improve system performance. Testing reveals the system deficiencies and gives us an opportunity to make necessary repairs. Duct Renovations are often necessary to allow systems to perform correctly. For years the HVAC...
by Jim Davis
Add a CO Testing Report to Your Service Procedures
